Electric mercury arc-lamp.



J. M. ANGK, DEGD. w. ANOK, ADMINISTRATOR.

ELECTRIC MERCURY ARC LAMP.

APPLICATION FILED MAY13,1904.

5 7 0 Patented Mar. 1-, 1910.

@5N, TEN,

JOHN M, anon, on PHILADELPHIA, PENNSYLVANIA; WILLIAM ANCK, ADMINISTM- TOE or SAID JOI-IN M. ANCK, DECEASED, ASSIGNOR or oNE-rwEL TH 'ro JoHn' a, WIEDERSHEIM, oma'rwnnrrrr T0 WILLIAM cannn WIEDERSEIM, onn-crwntr'ria- T0 HAYWARD FAIRBANKS, AND ONE-FOURTH T0 WILLIAM STEELL JACKSON, ALL OF PHILADELPHIA, PENNSYLVANIA.

nrlno'rnrc MERCURY also-LAMP.

Specification of Letters Patent.

Application filed May 13, 1904. Serial No. 207,849.

To all whom it may concern:

Be it known that T, JOHN M. ANcK, a citizen of the United States, residing in the cityand county of Philadelphia, State of Pennsylvania, have invented a new and useful Improvement in ElectricMercury ArclLamps, of which the following is a specification. I i y This invention consists of an improve ment in electric mercury arc lamps, as will be hereinafter fully described and claimed.

One of .the objects of my present invention has been to produce a starting device for electric mercury arc lamps, using a low voltage current and dispensing with a high voltage current produced by an induction coil for starting an arc in the tube as heretotoreconstructed. ll secure this result by using a. heater to heat the mercury contained in the tube as one electrode, and 'in doing so I vaporize part of the mercury, and at the same time causethe mercury to boil, which jumps in contactwith an electrode sealed in the tube that causes an arc to'be formed Which-instantly flashes through the tube and causes a conducting path' for the electric current in the mercury vapor.

Referring to the drawings: 1 is asealed glass tube exhausted of air to a partial vacuum, 2 is mercury inclosed in said tube as one electrode, 3 is an arc forming'electrode, 4 is the electric heater,.5 and 6 is resistance in the sparking circuit and heatercircuit, 7 is an'electromagnet in the main circuit of the tube, 8 is the armature in circuit with the heater, and arcing electrode, and is adapted to be moved outof contact with the side branch wire 9 when the main circuit is passing through the tube, and maintaining the are, 10 is the upper main circuit elec: trode composed of graphite iron or plati-- num, 11 is an electrodesealed in the glass contacting :with the 'mercury,'12 and 13 are theline wires, 14 is a carbon or platinum wire attached to electrode 10 which assists inbstarting the current through the main tu e. y

The operation of the lamp is as follows The circuit, as shown in the drawing, is, closed and the main circuit is operating through the'tube; the side branch is shown cut out. When the circuit is closed the current first flows through the circuit shown by single arrows, and the resistance 6. The

heater 4 heats the mercury 2 and brings it.

to boil,'cau sing an intermittent make and break with the arcing electrode 3 and form-' ing an arc which instantly flashes through the tube to the terminal 10 and so establishes Patented Mar. it, 191%.

by double arrows operates the armature 8 and cutsout the two side branches when the arc has been established in the main tube.

Having thus described my invention,.what

liclaim as new, and desire to secure by Letters Patent, is

' 1; k In an electric mercury arc lamp, a tube,

mercury eontained in said tube, an arcing electrode above said mercury, an electric heater adapted to .boil and vaporize said mercury, and cause contact with the arcing electrode.

2. In a starting device for an electric vapor lamp, spaced. electrodes of which the lower one is mercury, an intermediate arcing electrode, an electric heater for said mercury electrode, line Wires connected to the electric heater terminals, a connection between one of said .line wlres and the intermediate terminal, an armature in the connection between the intermediate electrode and the line wire, and an electrode-magnet controlling said armature andconnected between the spaced electrodes.

JOHN M. ANCK. Witnesses:

THOMAS J. BRADLEY, HARRY E. PARK." 

